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COMMITMENTS AND CONTINGENCIES (Tables)
 12 Months Ended
Dec. 31, 2022
Commitments and Contingencies Disclosure [Abstract]  
Schedule of Environmental Loss Contingencies by Site A reconciliation of the activity in the environmental reserves is as follows:
(Millions of Dollars)EversourceCL&PNSTAR ElectricPSNH
Balance as of January 1, 2021$102.4 $12.3 $4.7 $7.1 
Additions23.4 4.4 — — 
Payments/Reductions(10.4)(2.8)(1.4)(0.8)
Balance as of December 31, 2021115.4 13.9 3.3 6.3 
Additions12.6 0.9 0.4 0.5 
Payments/Reductions(5.4)(0.9)(0.3)(0.7)
Balance as of December 31, 2022$122.6 $13.9 $3.4 $6.1 

The number of environmental sites for which remediation or long-term monitoring, preliminary site work or site assessment is being performed are as follows:
EversourceCL&PNSTAR ElectricPSNH
20225913108
20216114119
Schedule of Estimated Future Annual Costs of Long term Contractual Agreement The estimated future annual costs of significant executed, non-cancelable, long-term contractual arrangements in effect as of December 31, 2022 are as follows:
Eversource       
(Millions of Dollars)20232024202520262027ThereafterTotal
Renewable Energy Purchase Contracts$751.8 $952.6 $954.8 $983.0 $998.5 $8,141.1 $12,781.8 
Natural Gas Procurement447.1 419.4 340.9 298.5 269.4 1,450.6 3,225.9 
Purchased Power and Capacity87.6 86.8 75.2 2.9 2.7 7.2 262.4 
Peaker CfDs20.3 21.1 17.9 16.0 11.4 64.4 151.1 
Transmission Support Commitments17.8 20.7 22.6 22.6 22.6 22.6 128.9 
Total$1,324.6 $1,500.6 $1,411.4 $1,323.0 $1,304.6 $9,685.9 $16,550.1 
CL&P       
(Millions of Dollars)20232024202520262027ThereafterTotal
Renewable Energy Purchase Contracts$594.8 $609.1 $610.2 $607.6 $609.0 $2,253.1 $5,283.8 
Purchased Power and Capacity83.5 83.9 72.4 0.1 — — 239.9 
Peaker CfDs20.3 21.1 17.9 16.0 11.4 64.4 151.1 
Transmission Support Commitments7.0 8.2 8.9 8.9 8.9 8.9 50.8 
Total$705.6 $722.3 $709.4 $632.6 $629.3 $2,326.4 $5,725.6 
NSTAR Electric       
(Millions of Dollars)20232024202520262027ThereafterTotal
Renewable Energy Purchase Contracts$79.2 $270.0 $316.5 $322.9 $328.6 $5,519.8 $6,837.0 
Purchased Power and Capacity2.9 2.9 2.8 2.8 2.7 7.2 21.3 
Transmission Support Commitments7.0 8.1 8.9 8.9 8.9 8.9 50.7 
Total$89.1 $281.0 $328.2 $334.6 $340.2 $5,535.9 $6,909.0 
PSNH       
(Millions of Dollars)20232024202520262027ThereafterTotal
Renewable Energy Purchase Contracts$77.8 $73.5 $28.1 $52.5 $60.9 $368.2 $661.0 
Purchased Power and Capacity1.2 — — — — — 1.2 
Transmission Support Commitments3.8 4.4 4.8 4.8 4.8 4.8 27.4 
Total$82.8 $77.9 $32.9 $57.3 $65.7 $373.0 $689.6 
The total costs incurred under these agreements were as follows:
EversourceFor the Years Ended December 31,
(Millions of Dollars)202220212020
Renewable Energy Purchase Contracts$678.1 $609.2 $584.2 
Natural Gas Procurement1,042.8 712.7 453.4 
Purchased Power and Capacity61.6 56.4 62.7 
Peaker CfDs13.4 24.3 22.7 
Transmission Support Commitments12.7 15.4 22.1 
 For the Years Ended December 31,
 202220212020
(Millions of Dollars)CL&PNSTAR
Electric		PSNHCL&PNSTAR
Electric		PSNHCL&PNSTAR
Electric		PSNH
Renewable Energy Purchase Contracts$513.2 $90.8 $74.1 $457.1 $84.7 $67.4 $426.3 $88.8 $69.1 
Purchased Power and Capacity57.7 3.0 0.9 53.1 3.0 0.3 59.3 3.1 0.3 
Peaker CfDs13.4 — — 24.3 — — 22.7 — — 
Transmission Support Commitments5.0 5.0 2.7 6.1 6.0 3.3 8.7 8.7 4.7 
Schedule of Guarantor Obligations
The following table summarizes Eversource parent's exposure to guarantees and indemnifications of its subsidiaries and affiliates to external parties, and primarily relates to its offshore wind business:  
As of December 31, 2022
Company (Obligor)DescriptionMaximum Exposure
(in millions)		Expiration Dates
North East Offshore LLC
Construction-related purchase agreements with third-party contractors (1)
$717.6 
 (1)
Sunrise Wind LLC
Construction-related purchase agreements with third-party contractors (2)
311.5 
2025 - 2026
Revolution Wind, LLC
Construction-related purchase agreements with third-party contractors (3)
419.1 2024 - 2027
South Fork Wind, LLC
Construction-related purchase agreements with third-party contractors (4)
142.1 2023 - 2026
Eversource Investment LLC
Funding and indemnification obligations of North East Offshore LLC (5)
77.0 
 (5)
South Fork Wind, LLC
Power Purchase Agreement Security (6)
7.1 
 (6)
Sunrise Wind LLC
OREC capacity production (7)
2.2 
 (7)
Bay State Wind LLCReal estate purchase2.5 2023
South Fork Wind, LLC
Transmission interconnection
1.2 —
Eversource Investment LLC
Letters of Credit (8)
4.3 —
Various
Surety bonds (9)
35.7 2023
Eversource ServiceLease payments for real estate0.5 2024

(1)    Eversource parent issued guarantees on behalf of its 50 percent-owned affiliate, North East Offshore LLC (NEO), under which Eversource parent agreed to guarantee 50 percent of NEO’s performance of obligations under certain purchase agreements with third-party contractors, in an aggregate amount not to exceed $1.3 billion with an expiration date in 2025. Eversource parent also issued a separate guarantee to Ørsted on behalf of NEO, under which Eversource parent agreed to guarantee 50 percent of NEO’s payment obligations under certain offshore wind project construction-related agreements with Ørsted in an aggregate amount not to exceed $62.5 million and expiring upon full performance of the guaranteed obligation. Any amounts paid under this guarantee to Ørsted will count toward, but not increase, the maximum amount of the Funding Guarantee described in Note 5, below.

(2)     Eversource parent issued guarantees on behalf of its 50 percent-owned affiliate, Sunrise Wind LLC, whereby Eversource parent will guarantee Sunrise Wind LLC's performance of certain obligations, in an aggregate amount not to exceed $465.8 million, in connection with construction-related purchase agreements. Eversource parent’s obligations under the guarantees expire upon the earlier of (i) dates ranging from March 2025 and April 2026 and (ii) full performance of the guaranteed obligations.     

(3)    Eversource parent issued guarantees on behalf of its 50 percent-owned affiliate, Revolution Wind, LLC, whereby Eversource parent will guarantee Revolution Wind, LLC's performance of certain obligations, in an aggregate amount not to exceed $546.7 million, in connection with construction-related purchase agreements. Eversource parent’s obligations under the guarantees expire upon the earlier of (i) dates ranging from May 2024 and November 2027 and (ii) full performance of the guaranteed obligations.

(4)    Eversource parent issued guarantees on behalf of its 50 percent-owned affiliate, South Fork Wind, LLC, whereby Eversource parent will guarantee South Fork Wind, LLC's performance of certain obligations in connection with construction-related purchase agreements. Under these guarantees, Eversource parent will guarantee South Fork Wind, LLC's performance of certain obligations, in a total aggregate amount not to exceed $207.7 million. Eversource parent’s obligations under these guarantees expire upon the earlier of (i) dates ranging from June 2023 and August 2026 and (ii) full performance of the guaranteed obligations.

(5)    Eversource parent issued a guarantee (Funding Guarantee) on behalf of Eversource Investment LLC (EI), its wholly-owned subsidiary that holds a 50 percent ownership interest in NEO, under which Eversource parent agreed to guarantee certain funding obligations and certain indemnification payments of EI under the operating agreement of NEO, in an amount not to exceed $910 million. The guaranteed obligations include payment of EI's funding obligations during the construction phase of NEO’s underlying offshore wind projects and indemnification obligations associated with third party credit support for its investment in NEO. Eversource parent’s obligations under the Funding Guarantee expire upon the full performance of the guaranteed obligations.

(6)    Eversource parent issued a guarantee on behalf of its 50 percent-owned affiliate, South Fork Wind, LLC, whereby Eversource parent will guarantee South Fork Wind, LLC's performance of certain obligations, in an amount not to exceed $7.1 million, under a Power Purchase Agreement between the Long Island Power Authority and South Fork Wind, LLC (the Agreement). The guarantee expires upon the later of (i) the end of the Agreement term and (ii) full performance of the guarantee obligations.

(7)    Eversource parent issued a guarantee on behalf of its 50 percent-owned affiliate, Sunrise Wind LLC, whereby Eversource parent will guarantee Sunrise Wind LLC's performance of certain obligations, in an amount not to exceed $15.4 million, under the Offshore Wind Renewable Energy Certificate Purchase and Sale Agreement (the Agreement). The Agreement was executed by and between the New York State Energy Research and Development Authority (NYSERDA) and Sunrise Wind LLC. The guarantee expires upon the full performance of the guaranteed obligations.     Effective January 1, 2023, exposure under the guarantee increased from $2.2 million to $11.0 million.
(8)    On September 16, 2020, Eversource parent entered into a guarantee on behalf of EI, which holds Eversource's investments in offshore wind-related equity method investments, under which Eversource parent would guarantee EI's obligations under a letter of credit facility with a financial institution that EI may request in an aggregate amount of up to approximately $25 million. In January 2022, Eversource parent issued two letters of credit on behalf of South Fork Wind, LLC related to future decommissioning obligations of certain onshore transmission assets totaling $4.3 million.

(9)    Surety bond expiration dates reflect termination dates, the majority of which will be renewed or extended.  Certain surety bonds contain credit ratings triggers that would require Eversource parent to post collateral in the event that the unsecured debt credit ratings of Eversource parent are downgraded.